What coolant does the Acura RSX use?
The Acura RSX uses Honda/Acura Long-Life Coolant Type 2 — a silicate-free HOAT ethylene glycol coolant. It is typically sold pre-mixed in a 50/50 solution and should be used in its Genuine Honda/Acura Type 2 formulation to protect the engine’s aluminum components.
The RSX, produced from 2002 to 2006, relies on a modern coolant formulation designed for aluminum engines and Honda/Acura cooling systems. The key requirement is staying within the Type 2 specification to ensure optimal corrosion protection, freezing/boiling point performance, and compatibility with the vehicle’s cooling system materials. Below are the essential details and practical options for owners and technicians.
Why Type 2 coolant matters for the RSX
Type 2 coolant, also called Long-Life Coolant Type 2, is designed to be compatible with the RSX’s aluminum engine block, radiator, and water pump seals. It provides ongoing protection against corrosion, scale buildup, and thermal extremes. Using a coolant that does not meet Type 2 specifications can lead to reduced protection and potential cooling-system issues over time.
When topping off or performing a coolant change, verify that the product is labeled as Honda/Acura Type 2 or Long-Life Coolant Type 2. The actual color of the coolant can vary by brand, but the specification is what matters for compatibility with the RSX’s engine and cooling components.
Below is a short list of commonly used options, along with guidance on how to select them.
Below are recommended options for RSX coolant, with a note on how to choose between them and what to look for on the label. Always prioritize official Type 2 compatibility and proper mixing ratios.
- Genuine Honda/Acura Long-Life Coolant Type 2 (premixed 50/50) — official factory coolant designed for Honda/Acura vehicles requiring Type 2 specification.
- Other HOAT coolants labeled as compatible with Honda/Acura Type 2 (premixed 50/50 or concentrate that you mix with distilled water) — check the packaging for Type 2 compatibility.
- Premium aftermarket coolants that explicitly state compatibility with Honda/Acura Type 2 (either premixed or concentrate to be diluted with distilled water) — ensure the product is clearly listed as Type 2 compatible.
Note: Do not use Type 1 (silicate-containing) coolant or universal coolants unless they explicitly state Type 2 compatibility. Mixing incompatible formulations can cause corrosion, gasket issues, and cooling-system failures. If in doubt, consult the owner’s manual or your local dealer for the correct specification.
Maintenance tips for the RSX cooling system
To keep the RSX cooling system in good shape, follow these best practices when handling coolant:
- Check coolant level when the engine is cold and top up with the correct Type 2 coolant if needed.
- When flushing or refilling, use coolant that meets Type 2 specifications; avoid mixing with non-Type 2 formulas.
- Replace coolant according to the vehicle’s maintenance schedule or at least every few years, ensuring a proper 50/50 mix (if using concentrate, mix with distilled water to achieve 50/50).
Always verify that the product you buy is clearly labeled as Honda/Acura Type 2 or Long-Life Coolant Type 2. If you cannot locate Type 2 coolant locally, contact an authorized Honda/Acura service center for guidance or alternatives that meet the same specification.
Summary
The Acura RSX relies on Honda/Acura Long-Life Coolant Type 2, a silicate-free HOAT coolant formulated for aluminum engines. Use Genuine Honda/Acura Type 2 coolant, preferably premixed in a 50/50 ratio, or any compatible Type 2 coolant. Avoid Type 1 or non-Type 2 formulations to prevent corrosion and cooling issues. Following the recommended specification and mixing guidelines helps maintain reliable cooling performance and engine longevity.
